fix: Update type hints to use newer Python syntax

- Replace Dict, List, Optional with dict, list,  < /dev/null |  None syntax
- Fix abstract method implementation in message.py
- Improve type annotations and function return types
- Remove unreachable code in get_current_task_tool.py
- Refactor HTML elements to use style attributes

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/do_tool/not_used/change_relationship.py

@@ -19,7 +19,7 @@ class RelationshipTool(BaseTool):
         "required": ["text", "changed_value", "reason"],
     }
 
-    async def execute(self, function_args: Dict[str, Any], message_txt: str = "") -> dict:
+    async def execute(self, function_args: dict[str, Any], message_txt: str = "") -> dict:
         """执行工具功能
 
         Args: